Effect of nickel and cobalt addition on microstructure and hardness of W-Ag composites produced via infiltration process |
کد مقاله : 1182-IMES-CONGR-FULL |
نویسندگان: |
Nader Parvin1، Reza Parastarnamini2، Reza Parastar Namin2، Mohammad Naeimi *3، Hadi Ghazanfari2 1Department of Mining and Metallurgical Engineering, Amirkabir University of Technology 2Amirkabir University 3Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Hafez Ave, Tehran, Iran |
چکیده مقاله: |
In this research, infiltration behavior of W-Ag composite compacts with Nickel and Cobalt as additives has been investigated. Nickel and cobalt were added to Tungsten powder by two distinct methods: mixing elementally and reduction of salt solution. The coated Tungsten powders were compacted under controlled pressures to make porous skeleton with 32-37 vol. % porosity. Infiltration process was carried out at 1100 ̊C at a reducing atmosphere. The effect of additives on infiltration of Ag was evaluated by SEM and Archimedes method. Also two different processes were applied and compared in each step . I) Sintering simultaneously with infiltration process , and II) Sintering prior to infiltration (pre-sintering process). It was found that specimens which were pre-sintered and then infiltrated with molten silver, represent higher hardness and finer microstructure than the specimens infiltrated simultaneously with sintering . |
کلیدواژه ها: |
Infiltration; W-Ag composites; Powder metallurgy; Mixing elementally; Reduction of salt solution |
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